I took the scratch plate off last night and had a look at the wiring. I've got a 1 Meg CTS pot in the tone position, but the solder on the volume pot is covering up the details; is it likely to also be 1 Meg or would it be lower? I didn't get a note of the cap values while I had it open so not sure what it is. Given the volume pot doesn't have a smooth sweep, it is worth just replacing the whole harness?